DEFENDER THE TERRA ATTACK ON THE RED UFO

The gameplay is relatively simple. Swarm after swarm of alien armies attack the player’s ship that moves left and right at the bottom of the wraparound screen. The ship can only have one shot on screen at a time. The player defeats one swarm, only to have it replaced by another more aggressive and challenging swarm in the next stage. A plain and repetitive starfield scrolls in the background.